Production on season two of Big Little Lies is currently underway in Monterey, California, and fans couldn't be more excited.

The Monterey Herald reported that cast members Nicole Kidman, Reese Witherspoon and Shailene Woodley were spotted at various locations throughout the town of about 28,000 people. It's unclear whether Meryl Streep, who will appear for the first time in Big Little Lies season two, was there, as well.

Although the three-time Oscar-winner wasn't spotted filming with her co-stars, fans do have some idea of what role she'll assume in the show when it returns.

Production on season two of HBO's Big Little Lies is currently underway in Monterey, California

On April 6, 2018, Nicole Kidman — who plays Celeste in Big Little Lies — shared a photo from the upcoming season of herself, her two on-screen children and Streep. According to the caption the photo is from her 'first day on the set with Meryl'.

The Australian actress revealed little else about the 68-year-old's participation in the show, but we do know she'll be assuming a grandmotherly role.

What else do we know about Big Little Lies Season two? Check it out.

When is Big Little Lies Season two coming out?

Season two of Big Little Lies started filming in March 2018. While no premiere date for the second season has been confirmed, Casey Bloys, the programming chief at HBO, has confirmed that it won't be back until 2019.

Asked by The Hollywood Reporter if viewers could expect to see the show in 2018, Bloys said: 'No. They start shooting in the spring. It's not going to air in 2018.'

Meryl Streep Big Little Lies

Meryl Streep will join the Big Little Lies Season two cast as Mary Louise Wright, the mother of the late Perry Wright (Alexander Skarsgard) — Celeste's husband. Per a casting announcement released in January 2018, Streep's character will arrive in Monterey, California, seeding answers about her son's death.

Perry may also appear in season two, though it's unclear in what capacity. Those who saw the first season of Big Little Lies know he was killed in the end, so it would have to be in flashback or dream sequences.

Big Little Lies Season two spoilers

HBO's official log line for season two of Big Little Lies is this: 'The subversive, darkly comedic drama Big Little Lies will explore the malignancy of lies, the durability of friendships, the fragility of marriage and, of course, the vicious ferocity of sound parenting. Relationships will fray, loyalties will erode...the potential for emotional and bodily injury shall loom.'

Few plot details about the upcoming season of Big Little Lies have been released so far. We know the show will delve deeper into Bonnie as a character, as well as some of the others. Bonnie will struggle to cope with what she's done, according to Deadline.

We also know Streep's character will try to do some digging into her son's death.

The outlet also reported that Big Little Lies viewers should expect to see Renata's marriage change in season two, though it's unclear exactly how.

Intro song to Big Little Lies

The theme song to Big Little Lies is Cold Little Heart by Michael Kiwanuka. It's available on YouTube and all major streaming services.

Is Big Little Lies on Netflix?

Big Little Lies book

Big Little Lies the book was written in 2014 by Liane Moriarty. It made the New York Times Best Seller list.

The show and the novel have a few key differences, including the setting and a number of plot points. For example, the book is set in Australia while the TV series is set in California.

Avenue Q doesn't exist in the book. Madeline (Reese Witherspoon) does work part-time at a local theater, but the play isn't in the works. She's also not having an affair with Joseph (Santiago Cabrera), the play director, in the book.

That doesn't mean no one's cheating in the book-version of Big Little Lies, however. In the novel, Renata (Laura Dern) and Harper (Kelen Coleman) learn their husbands are both sleeping with Renata's nanny, Juliette (Nelly Buchet).

Another minor difference between the Big Little Lies book and the TV show is that Madeline has a son in the book, rather than two daughters.

There are also a few huge differences between the book and the TV show version of Big Little Lies. For example, Jane knows what her attacker looks like in the book. She never goes to visit Saxon Baker, the interior designer. Instead she reveals the name to Celeste, who says that Perry has a cousin by their name.

It's later revealed that Perry has been using his cousin's name to get out of trouble for years. Jane confronts Perry during trivia night in the book.

In the book, after Jane and Celeste learn the truth about what Perry did to Jane, Celeste lends her a helping hand financially with her son Ziggy (Iain Armitage). After all, he is her twin sons' half-brother.

Another big difference between the book and the show is that Celeste is going to therapy alone in the book. Perry does eventually join her for a dual session, which goes about the same as it did on the TV show, however.

Lastly, in the book Bonnie pushes Perry after catching him being cruel to Celeste, which reminds her of her abusive father. In the book she shoves him over a balcony ledge, rather than a flight of stairs, though.

She later turns herself in to the police in the Big Little Lies novel.

You can purchase the book online at Amazon or any other major book retailer.

Who died in Big Little Lies?

Perry is the only one killed in Big Little Lies. Bonnie shoves him down a flight of stairs after seeing him attack Celeste at a trivia night. After the incident, she and the other women band together.